[U-Boot] [PATCH 1/9] arm926ej-s: Invalidate instruction cache in flush_cache

arden jay
2011-03-20T14:14:48Z

Hi Albert,

I got it, thanks your explaination.

2011/3/20 Albert ARIBAUD <albert.aribaud@free.fr>:
> Le 03/20/11 06:36, arden jay a ?crit :
>>
>> Hi Michael,
>>
>> I still have question. :)
>>
>> When ARM fetch instruction, it firstly try cache.
>> It then should have cache miss, and forces to reload the instruction
>> from memory?
>> Why it will have problem while U-boot& ?Kernel at the same memory
>> location?
>
> The error in your assumption is the "it then should have cache miss". A
> cache won't have a cache miss if it has already been fetched and not yet
> been invalidated, and the i-cache won't magically invalidate just because
> you do data writes at the location where the i-cache was fetched from; you
> end up with an i-cache that pretends to be valid but no longer matches the
> main memory content.
>
> Amicalement,
> --
> Albert.
>

--
cheers,
jay